INSECT FAUNA OF HUMAN EXCREMENT ^73 



June 20, fcEces taken in the latrines of the camp of the Dis- 

 trict of Columbia Militia at Leesburg, Virginia, were brought 

 to Washington, and on the ist of July two specimens of Miisca 

 doinestica issued. 



June 19, dried faeces collected in the same latrines were 

 brought to Washington. June 27, one specimen of Musca do- 

 mcstica issued; June 28, three more; on July i, one more. 

 The troops had left the camp on June 16, and their sinks were 

 left open, uncovered with lime, and dipterous insects bred freely. 



June 20, another lot was collected in these sinks, and on July 

 7 one specimen of M. doinestica issued. 



In July one specimen was captured in a privy at Snickers 

 Gap, Virginia, and one also in a privy at Marshall Hall, Mary- 

 land. Specimens were seen in privies at Leesburg, Virginia, 

 and at the Bathing Beach, District of Columbia, in the latter 

 part of May and the early part of June. 



September 13, a few specimens of the house fly were cap- 

 tured on faeces in a privy, but no adults were reared. 



July 24, 1900, a visit was made by Mr. Pratt to the summer 

 camp of the District Militia at Gaithersburg, Maryland. The 

 sinks were much better cared for than the previous year, but 

 numbers of house flies were found about the sinks. Eggs of 

 this species were seen in large clusters on fasces. In some in- 

 stances the patches were two inches in diameter and looked like 

 little patches of lime. 



MorelUa micans Macq. 

 This fly, which is a dark, shining, sometimes slightly bluish, 

 species, about the size of the house fly, or perhaps averaging a 

 little larger, seems to be an American species and is recorded 

 by Osten Sacken from Baltimore. Its breeding habits seem not 

 to have been previously known. This species was captured on 

 human excrement at Washington, May 12, and began to issue 

 from the same deposit on May 29, continuing to issue May 31, 

 and June 1,2, and 6, giving 17 days as a minimum duration for 

 a generation. On June 4 a deposit which had been exposed for 

 six days was placed in one of the breeding jars, and on June 8 

 specimens of this fly issued. A large number also issued on 

 Proc. Wash. Acad. Sci., December 1900. 



